SRN
SRP
ISET2
ACSET
GND
REGN
S V I
bq24630
www.ti SLUS894–JANUARY2010 Stand-Alone Synchronous Switch-Mode Lithium Phosphate Battery Charger with System
Power Selector and Low I q
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FEATURES•24-Pin4×4-mm2QFN Package
•300kHz NMOS-NMOS Synchronous Buck•Energy Star Low Quiescent Current I q Converter–<15m A Off-State Battery Discharge current •Stand-alone Charger Specifically for Lithium–<1.5mA Off-State Input Quiescent Current Phosphate
•5V–28V VCC Input Operating Range,Support APPLICATIONS
1-7Battery Cells•Power Tool and Portable Equipment
•High-Accuracy Voltage and Current Regulation•Personal Digital Assistants
•Handheld Terminals
–±0.5%Charge Voltage Accuracy
•Industrial and Medical Equipment –±3%Charge Current Accuracy
•Netbook,Mobile Internet Device and –±3%Adapter Current Accuracy李光洁近况
Ultra-Mobile PC
•Integration
–Automatic System Power Selection from DESCRIPTION
Adapter or Battery
The bq24630is highly integrated switch-mode battery –Internal Loop Compensation charge controller designed specifically for Lithium
–Internal Soft Start Phosphate battery.It offers a constant-frequency
synchronous PWM controller with high accuracy –Dynamic Power Management(DPM)
current and voltage regulation,charge •Safety Protection
preconditioning,termination,adapter current –Input Over-Voltage Protection regulation,and charge status monitoring.
–Battery Thermistor Sense Suspend Charge The bq24630charges the battery in three phases: at Hot/Cold and Automatically I CHARGE/8at preconditioning,constant current,and constant Hot/Cold or Warm/Cool voltage.Charge is terminated when the current
reaches a minimum user-selectable level.A –Battery Detection
programmable charge timer provides a safety –Reverse Protection Input FET
backup.The bq24630automatically restarts the –Programmable Safety Timer charge cycle if the battery voltage falls below an
–Charge Over-Current Protection internal threshold,and enters a low-quiescent current
sleep mode when the input voltage falls below the –Battery Short Protection
battery voltage.
–Battery Over-Voltage Protection
–Thermal Shutdown
•Status Outputs
–Adapter Present
–Charger Operation Status
•Charge Enable Pin
•6V Gate Drive for Synchronous Buck
Converter
•30ns Driver Dead-time and99.95%Max
Effective Duty Cycle
Please be aware that an important notice concerning availability,standard warranty,and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.Copyright©2010,Texas Instruments Incorporated Products conform to specifications per the terms of the Texas
Instruments standard warranty.Production processing does not
necessarily include testing of all parameters.
PACK+PACK-
SYSTEM
ADAPTER+ADAPTER-Cff 22pF
bq24630
SLUS894–JANUARY 2010
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This integrated circuit can be damaged by ESD.Texas Instruments recommends that all integrated circuits be handled with appropriate precautions.Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure.Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
DESCRIPTION (CONTINUED)
The bq24630controls external switches to prevent battery discharge back to the input,connect the adapter to the system,and to connect the battery to the system using 6-V gate drives for better system efficiency.The bq24630features Dynamic Power Management (DPM).These features reduce battery charge current when the input power limit is reached to avoid overloading the AC adapter wh
en supplying the load and the battery charger simultaneously.A highly-accurate current-sense amplifier enables precise measurement of input current from the AC adapter to monitor the overall system power.
NOTE:VIN=19V,BAT=3-cell LiFePO 4,I adapter_limit =4A,I charge =3A,I pre-charge =0.125A,I term =0.3A,2.5hr safety timer
Figure 1.Typical System Schematic
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ORDERING INFORMATION夜曲 歌词
ODERING NUMBER
PART NUMBER IC MARING PACKAGE QUANTITY
(Tape and Reel)
bq24630RGER3000 bq24630OAT24-Pin4×4mm2QFN
bq24630RGET250
PACKAGE THERMAL DATA(1)
T A=25°C DERATING FACTOR PACKAGE q JP q JA
POWER RATING ABOVE T A=25°C QFN–RGE(2)4°C/W43°C/W  2.3W0.023W/°C
(1)This data is based on using the JEDEC High-K board and the exposed die pad is connected to a Cu pad on the board.This is
connected to the ground plane by a2×2via matrix.q JA has5%improvement by3x3via matrix.
(2)For the most current package and ordering information,see the Package Option Addendum at the end of this document,or see the TI
Web site at www.ti.
ABSOLUTE MAXIMUM RATINGS(1)(2)(3)
over operating free-air temperature range(unless otherwise noted)
VALUE UNIT Voltage range VCC,ACP,ACN,SRP,SRN,BATDRV,ACDRV,CE,STAT1,–0.3to33V
STAT2,PG
PH–2to36V
VFB–0.3to16V
REGN,LODRV,ACSET,TS,TTC–0.3to7V
BTST,HIDRV with respect to GND–0.3to39V
VREF,ISET1,ISET2–0.3to3.6V Maximum difference voltage ACP–ACN,SRP–SRN–0.5to0.5V Junction temperature range,T J–40to155°C Storage temperature range,T stg–55to155°C (1)Stresses beyond those listed under absolute maximum ratings may cause permanent damage to t
he device.These are stress ratings
only,and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied.Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2)All voltages are with respect to GND if not specified.Currents are positive into,negative out of the specified terminal.Consult Packaging
Section of the data book for thermal limitations and considerations of packages.
(3)Must have a series resistor between battery pack to VFB if Battery Pack voltage is expected to be greater than16V.Usually the resistor
divider top resistor will take care of this.
RECOMMENDED OPERATING CONDITIONS
VALUE UNIT Voltage range VCC,ACP,ACN,SRP,SRN,BATDRV,ACDRV,CE,STAT1,STAT2,PG–0.3to28V
PH–2to30V
VFB–0.3to14V
REGN,LODRV,ACSET,TS,TTC–0.3to6.5V
BTST,HIDRV with respect to GND–0.3to34V
ISET1,ISET2–0.3to3.3V恭祝你福寿与天齐
VREF  3.3V Maximum difference voltage ACP–ACN,SRP–SRN–0.2to0.2V
T J Junction temperature range0to125°C
T stg Storage temperature range–55to155°C
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ELECTRICAL CHARACTERISTICS
5.0V≤V(VCC)≤28V,0°C<T J<+125°C,typical values are at T A=25°C,with respect to GND unless otherwise noted
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT OPERATING CONDITIONS
V VCC_OP VCC Input voltage operating range  5.028.0V QUIESCENT CURRENTS
Total battery discharge current(sum of
currents into VCC,BTST,PH,ACP,ACN,V VCC<V SRN,V VCC>V UVLO(SLEEP)15
m A SRP,SRN,VFB),VFB≤2.1V
I BAT
Battery discharge current(sum of currents V VCC>V SRN,V VCC>V UVLO CE=LOW5
into BTST,PH,SRP,SRN,VFB),VFB≤
V VCC>V SRN,V VCC>V VCCLOW CE=HIGH,Charge done5µA
2.1V
V VCC>V SRN,V VCC>V UVLO CE=LOW1  1.5
Adapter supply current(current into V VCC>V SRN,V VCC>V VCCLOW,CE=HIGH,charge done25
I AC mA
VCC,ACP,ACN pin)
V VCC>V SRN,V VCC>V VCCLOW,CE=HIGH,Charging,
12
Qg_total=20nC,V VCC=20V
V FB Feedback regulation voltage  1.8V
T J=0°C to125°C–0.5%0.5% Charge voltage regulation accuracy
T J=–40°C to125°C–0.7%0.7%
Input leakage current into VFB pin VFB=1.8V100nA
CURRENT REGULATION–FAST CHARGE
V ISET1ISET1voltage range2V
V IREG_CHG SRP–SRN current sense voltage range V IREG_CHG=V SRP–V SRN100mV
Charger current set factor amps of charge
K(ISET1)R SENSE=10mΩ5A/V current per volt on ISET1pin)
V IREG_CHG=40mV–3%3%
V IREG_CHG=20mV–4%4% Charge current regulation accuracy
V IREG_CHG=5mV–25%25%
V IREG_CHG=1.5mV(V SRN>3.1V)–40%40%
I ISET1Leakage current in to ISET1Pin V ISET1=2V100nA
CURRENT REGULATION–PRECHARGE
Precharge current R SENSE=10mΩ,VFB<V LOWV50125200mA
CHARGE TERMINATION
V ISET2ISET2voltage range2V
Termination current range R SENSE=10mΩ2A
Termination current set factor(amps of
K TERM1A/V termination current per volt on ISET2pin)
V ITERM=20mV–4%4%
Termination current accuracy V ITERM=5mV–25%25%
V ITERM=<1.5mV–45%45%
Deglitch time for termination(both edge)100ms
t QUAL Termination qualification time V BAT>V RECH and I CHARGE<I TERM250ms
I QUAL Termination qualification time Discharge current once termination is detected2mA
I ISET2Leakage current into ISET2pin V ISET2=2V100nA
INPUT CURRENT REGULATION
V ACSET ACSET voltage range02V
V IREG_DPM ACP-ACN current sense voltage range V IREG_DPM=V ACP–V ACN0100mV
Input current set factor(amps of input
K(ACSET)R SENSE=10mΩ5A/V current per volt on ACSET pin)
V IREG_DPM=40mV–3%3%
Input current regulation accuracy V IREG_DPM=20mV–4%4%
V IREG_DPM=5mV–25%25%
I ACSET Leakage current into ACSET pin V ACSET=2V100nA
INPUT UNDER-VOLTAGE LOCK-OUT COMPARATOR(UVLO)
V UVLO AC under-voltage rising threshold Measure on VCC  3.65  3.854V
V UVLO_HYS AC under-voltage hysteresis,falling350mV
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ELECTRICAL CHARACTERISTICS(continued)
5.0V≤V(VCC)≤28V,0°C<T J<+125°C,typical values are at T A=25°C,with respect to GND unless otherwise noted
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT VCC LOWV COMPARATOR
Falling threshold,disable charge Measure on VCC  4.1V
Rising threshold,resume charge  4.35  4.5V SLEEP COMPARATOR(REVERSE DISCHARGING PROTECTION)
V SLEEP_FALL SLEEP falling threshold V VCC–V SRN to enter SLEEP40100150mV
V SLEEP_HYS SLEEP hysteresis500mV SLEEP rising delay VCC falling below SRN,Delay to turn off ACFET1m s
SLEEP falling delay VCC rising above SRN,Delay to turn on ACFET30m s
SLEEP rising shutdown deglitch VCC falling below SRN,Delay to enter SLEEP mode100ms
SLEEP falling powerup deglitch VCC rising above SRN,Delay to exit out of SLEEP mode30ms ACN/SRN COMPARATOR
V ACN-SRN_FALL ACN to SRN falling threshold V ACN–V SRN to turn on BATFET100200310mV
V ACN-SRN_HYS ACN to SRN rising hysteresis100mV ACN to SRN rising deglitch V ACN–V SRN>V ACN-SRN_RISE2ms
ACN to SRN falling deglitch V ACN–V SRN<V ACN-SRN_FALL50m s BAT LOWV COMPARATOR
Precharge to fastcharge transition(LOWV
V LOWV Measured on VFB pin,rising0.3330.350.367V threshold)
V LOWV_HYS LOWV hysteresis100mV LOWV rising deglitch VFB falling below VLOWV25ms
LOWV falling deglitch VFB rising above VLOWV25ms RECHARGE COMPARATOR
Recharge threshold(with respect to
V RECHG Measured on VFB pin,rising110125140mV VREG)
Recharge rising deglitch VFB decreasing below V RECHG10ms
Recharge falling deglitch VFB increasing above V RECHG10ms BAT OVER-VOLTAGE COMPARATOR
V OV_RISE Over-voltage rising threshold As percentage of V FB108%
V OV_FALL Over-voltage falling threshold As percentage of V FB105%
INPUT OVER-VOLTAGE COMPARATOR(ACOV)
V ACOV AC over-voltage rising threshold on VCC31.043232.96V
V ACOV_HYS AC over-voltage falling hysteresis1V AC over-voltage deglitch(both edge)Delay to changing the STAT pins1ms
AC over-voltage rising deglitch Delay to disable charge1ms
可口可乐广告曲AC over-voltage falling deglitch Delay to resume charge20ms THERMAL SHUTDOWN COMPARATOR
T SHUT Thermal shutdown rising temperature Temperature increasing145°C
T SHUT_HYS Thermal shutdown hysteresis15°C Thermal shutdown rising deglitch Temperature increasing100m s
Thermal shutdown falling deglitch Temperature decreasing10ms THERMISTOR COMPARATOR
V LTF Cold temperature rising threshold Charger suspended below this temperature72.5%73.5%74.5%
V LTF_HYS Cold temperature hysteresis0.2%0.4%0.6%
Charger enabled,cuts back to I CHARGE/8below this
V COOL Cool Temperature rising threshold70.2%70.7%71.2%
temperature
V COOL_HYS Cool temperature hysteresis0.2%0.6%  1.0%
V WARM Warm temperature rising threshold Charger cuts back to I CHARGE/8above this temperature47.5%48%48.5%
V WARM_HYS Warm temperature hysteresis  1.0%  1.2%  1.4%
Charger suspended above this temperature before
V HTF Hot temperature rising threshold36.2%37%37.8%
initiating charge
Charger suspended above this temperature during
V TCO Cut-off temperature rising threshold33.7%34.4%35.1%
initiating charge
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ELECTRICAL CHARACTERISTICS(continued)
5.0V≤V(VCC)≤28V,0°C<T J<+125°C,typical values are at T A=25°C,with respect to GND unless otherwise noted
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Deglitch time for Temperature Out of
V TS>V LTF,or V TS<V TCO,or V TS<V HTF400ms Range Detection
Deglitch time for Temperature in Valid
V TS<V LTF–V LTF_HYS or V TS>V TCO,or V TS>V HTF20ms Range Detection
Deglitch time for current reduction to
V TS>V COOL,or V TS<V WARM25ms
I CHARGE/8due to warm or cool temperature
Deglitch time to charge at I CHARGE from
I CHARGE/8when resuming from warm or V TS<V COOL-V COOL_HYS,or V TS>V WARM-V WARM_HYS25ms
cool temperatures
Charge current due to warm or cool V COOL<V TS<V LTF,or V WARM<V TS<V HTF,or V WARM<I CHARGE
temperatures V TS<V TCO/8
CHARGE OVER-CURRENT COMPARATOR(CYCLE-BY-CYCLE)
我一个人住Current rising,in non-synchronous mode,mesure on
45.5mV
V(SRP-SRN),V SRP<2V
Charge over-current falling threshold
Current rising,as percentage of V(IREG_CHG),in
160%
synchronous mode,V SRP>2.2V
V OC
Minimum OCP threshold in synchronous mode,measure
Charge over-current threshold floor50mV
on V(SRP-SRN),V SRP>2.2V
Maximum OCP threshold in synchronous mode,measure
Charge over-current threshold ceiling180mV
on V(SRP-SRN),V SRP>2.2V
CHARGE UNDER-CURRENT COMPARATOR(CYCLE-BY-CYCLE)
V ISYNSET Charge under-current falling threshold Switch from SYNCH to NON-SYNCH,V SRP>2.2V159mV BATTERY SHORTED COMPARATOR(BATSHORT)
BAT Short falling threshold,forced
V BATSHT V SRP falling2V non-synchronous mode
V BATSHT_HYS BAT short rising hysteresis200mV
V BATSHT_DEG Deglitch on both edge1m s LOW CHARGE CURRENT COMPARATOR
Average low charge current falling Measure on V(SRP-SRN),forced into non-synchronous
V LC  1.25mV threshold mode
V LC_HYS Low charge current rising hysteresis  1.25mV
V LC_DEG Deglitch on both edge1m s VREF REGULATOR
V VREF_REG VREF regulator voltage V VCC>V UVLO,(0–35mA load)  3.267  3.3  3.333V
I VREF_LIM VREF current limit V VREF=0V,V VCC>V UVLO35mA REGN REGULATOR
V REGN_REG REGN regulator voltage V VCC>10V,CE=HIGH(0–40mA load)  5.7  6.0  6.3V
I REGN_LIM REGN current limit V REGN=0V,V VCC>V UVLO40mA TTC INPUT
T PRECHG Precharge time before fault occurs144018002160sec Precharge safety timer range(1)
Fast charge saftey timer range,with+/-
T CHARGE Tchg=C TTC×K TTC110Hr 10%accuracy(1)
Fast charge timer accuracy(1)0.047m F≤C TTC≤0.47m F–10%10%
K TTC Timer multiplier  1.4min/nF
V TTC below this threshold disables the safety timer and
TTC low threshold0.4V
termination
TTC comparator high threshold  1.5V梦醒时分伴奏
TTC comparator low threshold1V
TTC source/sink current455055m A BATTERY SWITCH(BATFET)DRIVER
R DS_BAT_OFF BATFET turn-off resistance V ACN>5V150Ω
R DS_BAT_ON BATFET turn-on resistance V ACN>5V20kΩ
V BATDRV_REG=V ACN–V BATDRV when V ACN>5V and
V BATDRV_REG BATFET drive voltage  4.27V
BATFET is on
(1)Verified by design
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